Well blood is thicker than water. In other words if you decide to make him your life partner and things don't work out you will have no one because your family will have disowned you. You have to be sure that being with him is the right decision for you. Either way if your family is willing not to speak to you if you decide to be with him then they are not the best family to have. If you are an adult it is time for you to make your own decisions and do what is in your best interest. Follow your heart.

Personally I don't believe in organized religion. Any family that is willing to disown their child because of their preference of partner is retarded. No offence!